Here's the deal.... The makers of Auto Transmissions (and for some reason even in our application) design them so that the shifts are smooth and as "imperceptible" as possible. To do this they actually have, during the shift, both gears (clutch packs) engaged at the same time. Handing the change in ratio over with as little disturbance as they can.

What this is doing though, is creating a Bunch of friction and friction = heat & wear. So, the modified VB is designed to eliminate some of that, the transition is firmer with less "mush". It's a subtle difference though, not as dramatic as you might think. You won't notice a Nigh & Day difference, not gonna chirp shifts or anything. Just know it's Much better for the life of the transmission.

At 150K though, I donno if it's gonna do much for yours. At this point you've got most of that wear already...

As already mentioned the stock shift is very loooooooooooooong and drawn out. This gives a car like feel, but who wants that in a truck? The longer the clutch packs are engaged the more friction is building and friction means heat and it also means increased wear and shorter component life, pretty simple really. The tuned valvebody will shorten the shifts up, and make the shift good and solid, this may not drop your trans temps a noticeable amount, but it will extend the life of the clutches. As for which one, flip a coin, when I bought mine Greg at FTVB was the only one doing them (2003) but to be honest, FTVB, BTS, John Woods, there is only so much you can do to a valvebody, take your pick.

NCH
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